KR20060088789A - Slab Strength Reinforcement Structure Using Strand and Its Method - Google Patents

Abstract

The technical problem to be achieved by the present invention is to increase the effect of post-tension and minimize the stress change of the reinforced structure by enabling the deflection control over the entire floor slab by tensioning the strand with a tensioner outside the beam of the floor slab It is to provide a slab strength reinforcing structure and a method using the strands made possible.

Technical problem of the present invention is a fixed fixing part fixed to one end of the strand at the intersection of the beam and the floor slab; A through hole penetrating the upper end of the beam facing the fixed fixing unit; The slab bearing strength reinforcement structure is achieved by using a strand consisting of a tension fixing unit in which the other end of the strand is tensioned by the tensioner through the through hole.

Floor slab, reinforcement, strand

Description

Structural strength reinforcement structure using strands and its method {omitted}

1 is a view for explaining a conventional steel wire reinforcement method by the post tension

Figure 2 is a side cross-sectional view showing a reinforcing structure as a first embodiment of the present invention

Figure 3 is a plan sectional view showing a reinforcement structure as a first embodiment of the present invention

Figure 4 is an enlarged cross-sectional view showing a fixed fixing unit in FIG.

5 is a perspective view illustrating a fixing member used in the fixing fixing unit of FIG.

6 is an enlarged cross-sectional view showing the tension fixing unit in FIG.

7 is a plan sectional view showing the tension fixing unit of FIG.

8 is a perspective view showing a fixing hardware of the present invention

9 shows an ideal arrangement of strands in a simple supporting slab.

Figures 10a, b, c is a view showing a reinforcement structure as a second embodiment of the present invention

11 is a side cross-sectional view showing a reinforcing structure as a third embodiment of the present invention.

12 is a plan sectional view showing a reinforcing structure as a third embodiment of the present invention.

FIG. 13 is a perspective view illustrating the fixing fixing unit of FIG. 10. FIG.

14 is a perspective view showing the tension fixing unit of FIG.

15a, b, c, d is a view for explaining the construction method of the reinforcing structure of the second embodiment of the present invention

<Description of the code | symbol about the principal part of drawing>

A: fixed fixing unit B: tension fixing unit

D: tensioner

1: strand 2,3: beam

2a: fixing hole 3a: through hole

4: floor slab 5: fixed hardware

6: high strength mortar 7a, 7b: tube

8: non-contraction mortar 10, 30, 40: fixing member

11,31,41: Vertical hole 11a, 31a, 41a: Fixing bolt

12,32,42 Horizontal ball 12a, 32a, 42a Anchor bolt

13,33,43: hole 14: grout outlet

20: fixed grip 30a, 30b: cone member

34,44: grout inlet

The present invention relates to a slab strength reinforcement structure using a strand and a construction method thereof, in particular a slab strength reinforcement structure in which one side of the strand is fixed to the slab end with a fixed grip fixing portion and the other side is tensioned and fixed through a beam or wall. And a construction method thereof.

In general, concrete is strong in compression but weak in tension. Bending stress and deflection occur when a load is applied to slabs and beams, and structures made of concrete only cause cracking even in the small tensile force generated on the bottom of the material. Therefore, reinforced concrete structure is integrated with reinforcing bar in concrete to compensate for this.

The bottom crack caused by the load, which is the weakest point of concrete, requires more than a certain thickness of coating due to the factors such as meeting the fire resistance standards and securing the integrity of the reinforcing bars, so reinforced concrete itself may be limited in preventing cracking. There is nothing else.

Conventional slab reinforcement methods include fiber sheet and steel plate attachment method, cheolgolbo reinforcement method, steel wire reinforcement method and the like.

The fiber sheet and steel plate attachment method has a difficulty in the construction of the building in use because the fine dust is generated during the work to process the base surface is attached to the fiber sheet and steel sheet can be installed by removing the finishing material, the adhesive material is fireproof There was a problem that did not meet the criteria. Fireproof coating to meet the fire resistance standard is not a small amount of load increase, resulting in an increase in reinforcement amount, which leads to an excessive increase in construction cost.

The steel frame reinforcement method was not only difficult to transport the heavy steel beam to the city plant inside the building, but also needed to reinforce the support member by changing the stress distribution of the slab and beam to be reinforced.

In addition, in the conventional steel wire reinforcement method by post-tension as shown in Figure 1 by tensioning the steel wire (c) using a tensioner in a state attached to the fixing device at a predetermined interval to the bottom of the bottom slab (a) Although a method of fixing is proposed, it is impossible to control the deflection of the entire slab because it requires a minimum space to install the tensioner between the slab and the beam (b). There is a problem that causes tensile stress and increases the compressive force in the lower portion.

The technical problem to be achieved by the present invention is to increase the effect of post-tension and minimize the stress change of the reinforced structure by enabling the deflection control over the entire floor slab by tensioning the strand with a tensioner outside the beam of the floor slab It is to provide a slab strength reinforcing structure and a method using the strands made possible.

Another technical problem of the present invention is to maintain a sufficient strength against the compressive force generated by the tension of the strand by the effect of lowering the neutral axis using a high-strength mortar for fireproof coating.

Technical problem of the present invention is a fixed fixing part fixed to one end of the strand at the intersection of the beam and the floor slab; A through hole penetrating the upper end of the beam facing the fixed fixing unit; It is achieved by the slab load-bearing structure and the construction method using the strand consisting of a tension fixing unit that is fixed in the state in which the other end of the strand is tensioned by the tensioner through the through hole.

Another technical problem of the present invention is achieved by a slab strength reinforcing structure using a high-strength mortar-stranded structure so as to embed the bottom of the bottom slab reinforced by strands as described above, and the construction method thereof.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 show a slab reinforcement structure as a first embodiment of the present invention, in which one end of the strand 1 is fixed at the intersection of the beam 2 and the bottom slab 4 as shown. Fixed fixing unit (A); A through hole (3a) passing through the upper end of the beam (3) facing the fixed fixing unit (A); A tension fixing part (B) which is fixed at the other end of the strand (1) by the tensioner (D) through the through hole (3a); It consists of a fixed hardware (5) installed in the center of the floor slab (4).

According to the present invention, as shown in FIG. 3, the strands 1 are installed on the bottom slab 4 to be reinforced so that the positions of the fixing fixing unit A and the tension fixing unit B are alternately arranged.

Preferably, the through hole 3a of the beam 3 is inclined downward from the inside of the bottom slab 4 to the outside.

As shown in FIGS. 4 and 5, the fixed fixing unit A has a vertical hole 11 to which the fixing bolt 11a is coupled to the bottom slab 4 in a horizontal plane, and is installed in the beam 2. A fixed side fixing member 10 having a horizontal hole 12 through which the anchor bolt 12a passes, in a vertical plane, and having a hole 13 through which the strand 1 passes in the center of the vertical plane; A fixed grip (20) installed at one end of the strand (1) passing through the hole (13); It is formed in the beam (2) is a fixing hole (2a) is fixedly installed in a state in which the fixed grip 20 is put;

As shown in FIGS. 6 and 7, the tension fixing unit B has vertical holes 31 and 41 in which the fixing bolts 31a and 41a are coupled from the bottom slab 4, and is formed in a horizontal plane. Horizontal holes 32 and 41 through which anchor bolts 32a and 42a installed in (2) pass are formed in a vertical plane, and holes 33 and 43 through which strands 1 pass through the center of the vertical plane. Tension side first and second fixing members 30 and 40 respectively formed and fixed to both sides of the through hole 3a; Cones (40a, 40b) for fixing to the tension-side second fixing member 40 in the state in which the strand (1) passing through the holes 33, 43 is tensioned with the tensioner (D).

The tensioner (D) is a known one using hydraulic pressure, and is used to tension the strand 1 and to install the cone members 40a and 40b.

8 is a perspective view showing the fixing hardware 5 installed in the middle of the bottom slab (4).

In order to construct the reinforcing structure of the present invention as described above, first, a support for safety and sag correction during installation is installed, and the fixing member 10 is coupled to one end of the strand 1 to the fixed grip 20 through the hole 13. (30) and (40) are anchored bolts (11a) (31a) (41a) and anchor bolts (12a) (32a) (42a) at the corners where the bottom slab (4) and the beams (2) (3) intersect. Install. At this time, the fixing grip 20 is fitted into the fixing hole (2a) and fixed, the fixing hardware (5) is installed in the middle of the bottom slab (4) with a bolt.

The other end of the strand 1, which has passed through the through hole 3a of the beam 3, is pulled and tensioned by the tensioner D, and then fixed to the fixed side second fixing member 40 by the cone members 30a and 30b. When it is settled in the structure, the tension of the strand 1 is applied to the concrete forming the floor slab 4, and the compressive stress is generated in the concrete to offset the tensile stress caused by the external force, thereby removing the cause of the crack in the concrete. This is done.

Since the bottom slab 4 reinforced by the tension-fixed strand 1 is eccentric with respect to the center of the bottom slab 4, the reinforcement is effective at the center portion, but the tensile stress is further added at the upper end portion. Generated and the compressive stress is maximized below the end.

In the present invention, the end compressive stress is solved by the high strength mortar, and the additional tensile stress is increased by the resistance moment of the existing rebar with increasing cross section.

10a, b, and c show a state in which the high strength mortar 6 is worked to give durability and fire resistance to stresses that are increased by the strand 1 being eccentric with respect to the center of the bottom slab 4. 10A is a bottom view, FIG. 10B is a cross-sectional view taken along the line 'ga-ga' of FIG. 10A, and FIG. 10C is a cross-sectional view taken along the line 'na-na' of FIG. 10A.

This allows the high strength mortar 6 to be made wider on the beams 2 and 3 in order to increase the fire resistance and load resistance in the state where the bottom slab 4 is reinforced with the strands 1 as in the first embodiment. The high-strength mortar (6) is examined to have a sufficient safety against the compressive force and adjusted to minimize the width and height.

The high strength mortar 6 at the end side serves to pull down the neutral axis of the bottom slab 4, wherein the fixing member 30 is installed by the tension force while installing the strand 1 close to the neutral axis at the end. Ensure sufficient strength against compression.

11 to 14 show that as the third embodiment of the present invention, in the second embodiment, as shown, the strand 1 is placed in a flexible and flexible tube 7a, 7b, and The grout injection ports 34 and 44 are formed in the tension fixing members 30 and 40 so as to communicate with the pipes 7a and 7b, respectively, to protrude upward from the bottom slab 4, and to fix the fixing sides. The member 10 is formed with a grout outlet 14 in communication with the tube 7b.

The grout inlet (34) 43 is a passage through which the grout is injected into the pipe (7a) (7b) after the tension work of the strand (1) is completed, the grout outlet 14 is a passage through which the grout is discharged Becomes

The pipes 7a and 7b used a sheath (bellows) pipe, and the pipes 7a and 7b were formed using holes known in the fixing member 10, 30 and 40 using a known sleeve. 33) (43).

Figure 15a, b, c, d is a view for explaining the construction method of the third embodiment of the present invention first to perform the surface treatment and crack repair work on the high-strength mortar (6) working site, for safety and sag correction during construction In the state where the support is installed, preliminary work is performed to form holes for installing the fixing members 10, 30 and 40 as shown in Fig. 15A.

In this state, one end of the strand 1 inserted into the pipes 7a and 7b is coupled to the fixing grip 20 through the hole 13 and the fixing members 10, 30 and 40 are fixed to the fixing bolt ( 11a) 31a, 41a and anchor bolts 12a, 32a, 42a are installed at the corners where the bottom slab 4 and the beams 2, 3 intersect as shown in FIG. 15B. At this time, the fixing grip 20 is fitted into the fixing hole (2a) and is fixed, the grout outlet 14 and the grout inlet (34, 44) protrudes to the top of the bottom slab 4 and the fixing hardware (5) also floor slab It is installed in the middle of (4).

In order to increase the bonding force between the fixing members 10, 30 and 40, the fixed hardware 5 and the bottom slab structure, the non-shrink mortar 8 works.

Tensioner (D) is first tensioned the strand (1) put into the tube (7a) (7b) and high-strength mortar (6) to achieve the required strength of the high-strength mortar (6) after the tensioner (D) To complete the second tension.

In the state of disassembling the support support and confirming the reinforcement state, grout injection work is performed inside the pipes 7a and 7b through the grout injection holes 34 and 44 as shown in FIG. 15C and the fixing members 10 and 30 are disposed. When finishing the work 40, the reinforcement of the floor slab 4 is completed as shown in FIG. 15D.

Thus, the present invention is capable of sag control in the state where the tension-stranding strand is installed in the entire floor slab, and it is possible to control the strength and vibration by increasing the minimum fixed load in high-rise apartments or roofing greening projects, and considering fire resistance performance. It is a useful invention that can minimize the weight and construction costs, and can be continuous construction.

The present invention has been described above with reference to the accompanying drawings, but is not limited thereto, and various modifications may be made without departing from the spirit of the present invention.

Claims (11)

A fixed fixing unit A in which one end of the strand 1 is fixed at the intersection of the beam 2 and the bottom slab 4; A through hole (3a) passing through the upper end of the beam (3) facing the fixed fixing unit (A); A tension fixing part (B) which is fixed at the other end of the strand (1) by the tensioner (D) through the through hole (3a); Slab strength reinforcement structure using a strand consisting of a fixed hardware (5) installed in the center of the bottom slab (4). The slab strength reinforcing structure using strands according to claim 1, wherein positions of the fixed fixing unit (A) and the tension fixing unit (B) are alternately arranged on the bottom slab (4). The slab load bearing reinforcement structure according to claim 1, wherein the through hole (3a) is inclined downward from the inside of the bottom slab to the outside. 2. The anchor bolt 12a of claim 1, wherein the fixed fixing part A is formed in a horizontal plane with a vertical hole 11 to which the fixing bolt 11a is coupled from the bottom slab 4. A horizontal hole 12 through which is formed a vertical side, and a fixing side fixing member 10 having a hole 13 through which the strand 1 passes in the center of the vertical surface; A fixed grip (20) installed at one end of the strand (1) passing through the hole (13); Slab load-bearing reinforcement structure using a strand, characterized in that consisting of; a fixing hole (2a) formed in the beam (2) is fixedly installed in a state in which the fixed grip 20 is put. The method of claim 1, wherein the tension fixing unit (B) is a vertical hole 31, 41 to the fixing bolts 31a, 41a is coupled to the floor slab 4 is formed in the horizontal plane, is installed in the beam (2) Horizontal holes 32 and 41 through which the anchor bolts 32a and 42a pass through are formed in the vertical plane, and holes 33 and 43 through which the strands 1 pass are formed in the center of the vertical plane, respectively. Tension side first and second fixing members (30) and (40) fixed to both sides of (3a); Consisting of cone members 40a and 40b for fixing the strand 1 passing through the holes 33 and 43 to the tension-side second fixing member 40 in a state in which the strand 1 is tensioned with the tensioner D. Slab strength reinforcement structure using a strand. The slab strength reinforcing structure using strands according to claim 1, wherein a high-strength mortar (6) is applied to said strands (1). The grout inlet according to claim 1, wherein the strand (1) is placed in a flexible and flexible tube (7a) (7b), and the grout injection hole (33) communicates with the tube (7a) (7b) to the fixing member of the tension fixing part (B), respectively. (34) and (44) are formed so as to protrude to the upper portion of the bottom slab (4), the fixing member of the fixed fixing portion (A) is formed with a grout outlet (14) in communication with the tube (7b) 7a) Slab load-bearing structure using strands, characterized in that the grout is injected into the interior. 8. The slab load bearing reinforcement structure according to claim 7, wherein the pipes (7a) (7b) are sheath pipes. 8. The slab strength reinforcing structure using a strand according to claim 7, wherein the fixing member and the fixing iron are installed by non-shrink mortar. A preliminary work step of performing surface treatment and crack repair work on the high-strength mortar work site, and forming a hole for installing the fixing member in the state of installing a support for safety and deflection correction during construction; A member installation step of coupling one end of the strand inserted into the tube to the fixed grip through the hole and installing the fixing member at the corner where the bottom slab and the beam intersect with the fixing bolt and the anchor bolt; A primary tension step of first tensioning the piped strand with a tensioner and performing high strength mortar work; Completing the second tension work with a tensioner; Dismantling the support support and grout injection into the pipe through the grout inlet; Slab strength reinforcement method using the strand consisting of. The method of claim 10, wherein the member installation step of the slab bearing strength reinforcement using a strand, characterized in that the non-shrink mortar operation is added.

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